Did you know that Mr. Limpet from "The Incredible Mr. Limpet" movie (Warner Bros.) is in the Ariel ride at DCA? You can see him on your right when you pass Ariel in the "Under the Sea" scene. Don Knotts, who played Mr. Limpet, appeared in several Disney movies. (The Incredible Mr.Limpet peeks out from behind green seaweed during the "Under The Sea" portion of the ride. Just as you pass Flounder scooching bottoms with a dancer fish, look over your right shoulder to see the fish with spectacles! - Nitza)

At California Adventure, the Seaside Souvenirs shop has a Hidden Mickey balloon painted on the backdrop above the top shelf. On the same backdrop on different portions of the stand there are also two Nautilus submarines (one hidden by decorations periodically). I thought this was a unique uncommon hidden character. Not a Mickey, but fun nonetheless. [Two brown Nautilus submarines are painted high on the walls behind merchandise shelves inside the shop. (Note: “Nautilus” is the submarine, commanded by Captain Nemo, in Jules Verne’s novel "Twenty Thousand Leagues Under the Sea.")]